Fluid-operated motor.



11. c. RANDALLr FLUID OPERATED MOTOR- APPLICATION FILED JUNE 24. 191-4.

Patented Apr. 16,1918

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HORATIOI o. RANDALL, or sen FRANCISCO, oanrronnra FLUID-OPERATED oron.

Specification of Letters Patent. PatentedApr. 16, 1918;

Application tiled June 24, 1914. Serial No. 846,990.

To all whom it may concern: I .Be it known that I, HoRA'no C. RANDALL,

a citizen of the United States, nd a resi-" dent of the city and county of San Franclsco, State of California, have lnvented certain new and usefullmprovements 1n Fluid-Operated -Motors, of which the following is a specification.

The lnvention relates to motors which are adapted to be operated by fluid under pressure, and particularly by'compres'sed air.

An object of the invention is to provide a fluid operated motor of improved construction. Another object of'the invention is to provide a double-ended fluid operated motor which may be readily operated by hand in the event. of a failure of the fluid supply.

Another object of the invention is to provide a double ended fluid operated motor in which 'no stufiing boxe are used and in which the final. movement of the movable element operates to cut off the supply of fluid thereto and in which a controllable fluid'cushion is provided which retards the movement of the movable element as itiapproaches the end of its movement.

4 The invention possesses other advanta geous features, some of which, with the foregoing, will be set forth at length in the following description where I shall outlinein full that form of the invention which I have selected for illustration in the drawings accompanying and formlng part of the present specification. In the drawings I have shown only one specific form of my generic inven tion. but it is to be understood that I do not limit myself to such form because mv invention may be embodied in a mult plicity of forms within the scope of the appended claims, each being a species of my said invention. It is also to'he understood that by the claims succeeding the description of my invention, I desire to cover t e invention in whatever form it may be embodied.

Referring to said drawings: I Figure 1 is a side View of one form of the motor of my invention, parts thereof being shown in section to more clearly illustrate its structure.

Fig. 2 is atop'or plan yiew of a portion of the motor of my invention, a part thereof being broken away to reduce the size of the figure and a part thereof being shown in section.

Fig. 3 is side view from the rear s de showing the application of the motor thereto. I

Fig. '6 is a perspective view of the lock releasing and actuating lev'er.

1 Fig.7 i a perspective view of the locking ever.

Fig. 8 is a plan .ortop view of a portion of the motor slitiwing the arrangement of the fluidcondu'it; I

' -.Fig. 9 is a detail ofthe controlling valve disk. I

Fig. 10' is a vertical section of the controlling valve taken on the line-A-A Fig. 8. f

Fig..1l isnnelevation of the cap or head closing the'end ofthe cylinder.

Fig. 12 is a vertical section of'the cap or head takenon the line B B Fig. :11.

The motor of my invention is particularly adapted tohoused 1n opening and closing elevator doors, using compressed air as the motive fluid, but it is to" be understood that it. is notlimited to such use, 211- though in such'use it possesses'many advantageous features, such aswlocking the door in the closed position and retarding themovement of the door as it reaches'the end of its throw in either direction, thereby obviating all banging and jarring of the doors It frequently happens in elevator door control systems which are operated by compressed an, that the .air compressor or some other part of the system breaks down or becomes out of order, inwhich instance it/Is impossible to open. and close the doors by hand. By the use of the'motor of myirfvention. however, should the rnptive fluid supply fail, the door may be readily opened and closed byhand, so

icefis not interrupted. Y

The motor shown in the accompanying drawings comprises a frame 2 upon which are mounted. the oppositely disposed cy1inranged the pistons 56, Mounted in the frame and extending into the cylinders 34 is a bar or rod "7, which is not connected to the pistons, but which normally contacts w th th p o the leng h of he bar b that the elevator servders 34 in which are respectively. ar-

' tion.

inders. This feature is particularly advantageouswhen the motor is used for operating elevator doors.

Attached to the bar-7 is a lug or bracket 42 to which the device to be moved is connected. In the application of'the motor shown in Fig. 5 the lug 42 is pivoted'to a lever 43 fulcrumed at its upper end and connected at its lower end to the elevator door 44. lVhen the lug 42is in the posieiOn shown in Fig. 1, the door is closed and when it is in the position shown in Fig. 4, the door is open.

Means are provided for locking the bar 7 and consequently the door 44 in the closed position or any, other movable element attached to the bar in a predetermined posi- Pivoted on the frame 2 behind the bar 7 is a dog 45, which is provided at its free end with a tooth or projection 46, -which' is adapted to seat inla cavity or slot 47 in thebar and lock it in position. The bar 7 is provided on its rear face with a longitudinal groove or slot 48 and the cavity or slot 47 opens into this groove '48. \Vhen the dog is raised, the tooth 46 is disposed in the slot, so that the'bar is free to move. The movement of. the dog is accomplished by means of an actuating lever 49, pivoted intermediate its ends to the frame, and

provided at its lower end with an actuating rod 51. Secured to the-lever 49 is a pin 52 which extends into the-groove 48 in the bar, and mounted on the pin is a roller 53 which normally rests in a depression 54 in the dog, the depression being so formed that as the lever is rocked in either direction, the dog is raised to lift the tooth 46 out of the cavity 47. Attached to' the upper end of-the actuating lever 49 is a link 55 which is connected by, the link 56, to the lever 57 secured to the valve stem. 33. p

The motor shown in Fig. l is arranged so that a movement of the lever 49 ina counter clockwise direction to the position indicated in Fig. 4, causes a movement of the bar 7 to the right. In the present instance the position of the bar in Fig. 1 corresponds to the closed position of the elevatordoor and the position shown in Fig. 4-corresponds to the open position of the elevato'r door :44.

i A movement of the actuating lever 49 thereof the lever in a clockwise direction from 1 fore, in a counter clockwise direction from its neutral position, operates to open the door, and with the door open, a movement its neutral position operates .to close the door. With the lever inthe position shown in Fig. 4, the door is held open; Attached to the lever 49, adjacent its lower end is a spring 58 which is attached at its other end to the frame 2. When the pull or pressure on rod 51 is released, the spring 58 moves the lever into the oppositely inclined position, in which position the valve '25 is set to cause a movement of the bar to the left. Arranged on the bar 7, preferably in the groove 48, is a pin or abutment 59, whic as the vbar approaches theend of its throw toward the'left, engages the pin 52 on lever 49 and moves'the lever to its. neutral position, thereby shutting of the supply of fluid to the cylinders. With the lever in this position, the dog 45 is free todrop and the tooth 46 drops into the cavity 47 and locks the bar. v i I When the motor is employed in connection with an elevator door, the rod 51 is provided with a lug 63 in a position, when the door is closed, to be engaged'by a shoe 64 which is carried by the elevator car.

The .shoe is carried upon two pivotally' mounted links 65 connected by a rod 66 to an operating lever 67 in the car. Operation eflected by operation of the control lever'67 Y in the'car moves the rod 57 and actuates the door opening mechanism as previously explained. When-the operating lever. 67 is moved to retractthe shoe, the spring 58.

the door closing mechanism.

. I claim: 1. Ina fluid operated motor, a pair of draws the lever 49 back, settingin motion oppositely disposed cylinders, pistons in said cylinders,:a bar engaging said pistons arid unattachedzthereto, a conductor connected to each cylinder at the end and at a point remote from the end, said'latter connection being arranged topermit a discharge only of the fluid, and the end connections being arranged to permit inlet and discharge of the fluid, and a valve connected to said conductors adapted to be operated .to control the passage of fluid through said conductors.

2. In a fluid operated motor, a pair of oppositely'disposed cylinders, pistons in said cylinders adapted to be moved longitudinally independently of each other, a

bar engaging said pistons, means for controlling the admission and discharge of fluid from said cvlinders, and means for locking the barat the end of its stroke.

3. In a fluid operated motor, a pair of oppositelv' disposed cylinders, pistons in said cylinders, said pistons being movable independently, to the ends of said cylinders,

a bar engaging said pistons, means for controlling the admissionand discharge offluid from said cylinders,'means for locking the bar in a predetermined'position, andmeans for releasing said lock and operating said fluid. controlling means.

4. In a fluid operated motor, a cylinder, a piston in said cylinder, a bar engaging said piston provided with a longitudinal slot, a valve for controlling the admission and discharge of fluid from said cylinder, a lever for operating said valve, a pin onsaid lever extending into said slot, and an abutment in said slot adapted to contact with said pin and move the lever into neutral position. 4

5. Ina fluid operated motor, a pair. of oppositely disposed cylinders, pistonsv in said cylinders adapted to be moved independently to the ends of said cylinders, a. bar engaging said pistons, a valve for con- .trolling the admission and discharge of fluid from said cylinders, a lever for operating said valve, and means on the said bar arranged to move the lever into neutral position as the bar reaches the end of its stroke.

6. In a fluid operated motor, a cylinder, a

piston in said cylinder, a bar engaging said piston having a depression therein, a valve for COIltIOlliIlg the admission and discharge of fluid from said cylinder, a lever for operating said valve, a dog adapted to engage in the depression in the bar and lock it against movement, and means connecting said lever and dog so that a movement of the lever from neutral position disengages the dog from said bar.

7. In a fluid operated motor, a pair of oppositely disposed cylinders, pistons in said cylinders adapted to be moved independently to the ends of said cylinders,a bar engaging said pistons, a valve for controlling the admission and dischargeof fluid from said cylinders, a lever connected to said-valve, means for moving the lever to position the valve to allow one cylinder to charge and the other to discharge, and a spring for reversing the position of the valve.

oppositely disposed cylinders closed at theirremote ends and open at their adjacent ends, pistons in said cylinders adapted to be moved independently to the said remote ends, a bar arranged between said pistons, a valve for controlling the admission and discharge of fluid from said cylinders, a lever for controlling said valve, and means for moving said lever to the neutral inoperative position as the bar reaches the end of its stroke.

10. In a. fluid operated motor, a pair of oppositely disposed cylinders closed at their remote ends and open at their adjacent ends, pistons in said cylinders adapted tov be moved independently to the said remote ends, a bar arranged between said pistons,

a valve for controlling the admission and discharge of fluid from said cylinders, a lever for controlling said valve, and means for moving said lever to the neutral inoperative position as the bar reaches the end of its stroke. i

11. In a fluid operated motor, a pair of oppositely disposed cylinders, a piston in each cylinder and a bar arranged between said pistons and unattached. thereto whereby one of the pistons moves the other when the direction of its movement is toward that other, said bar being adapted to be moved independently of said pistons.

12. Ina fluid operated'motor, a pair of oppositely disposed cylinders, a bar lying between and movable in said cylinders, and a piston in each cylinder adapted to abut against the end of said bar to move the same and the other piston, said bar being adapted to be moved independently of said pistons.

In testimony whereof, I have hereunto set my hand at San Francisco,'California,

this 17th day of June 1314 I HOBA'IIO O. RANDALL. In presence of- H. G. .Prosr, P. S.,P1DWELL. 

